37 tons yield...that's right...tons. Note that the balloon it was suspended from is clearly visible. This was a test of the so-called Gnat device....meant to be a tiny primary in future hydrogen bombs.

1) MS K-TYPE BLIMP FLYING LOW OVER THE GROUND BLIMP LANDS ON THE FLATS. MEN CATCH MOORING LINES AND ATTACH THEM TO A JEEP. F2) CU PORTABLE MOORING MAST BEING TOWED TOWARD THE NOSE OF THE BLIMP. G3) LA MS MOORING MAN ATOP MAST AS NOSE OF BLIMP IS PULLED TOWARD THE TOP OF THE MAST. G4) MS CONTROL CABIN OF THE BLIMP. G5) LA MS BLIMP BEING SECURED TO THE MAST. G6) MCU SEVERAL PERSONNEL NEAR CONTROL CABIN AS JEEP TOWS BLIMP AND MAST MOUNTAINOUS TERRAIN BG. G7) CU A4D IN FLIGHT LIGHT BLINKS ON STRBD. SIDE OF AIRCRAFT WHICH IS IN SILHOUETTE (NIGHT SCENE). G8) MS A4D IN FLIGHT AS SUN RISES IN BG AIRCRAFT IN SILHOUETTE (SV DIFFERENT ANBLES).G9) CU AIRCRAFT BANKING TO LEFT. G10) ATOG LS SUN RISING OVER MOUNTAIN PEAKS HEAVY CLOUDS SKY IS BEAUTIFUL (VERY GOOD SCENE).

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Joe-4 was the Soviet's first attempt at a fusion device but didn't produce the desired yield. A 'mere' 400 kilotons. It was also called the 'Sloika'...a Russian layered pastry...due to the layers of lithium-6 & deuterium surrounding the pit.